Re: Question....where is the extra dirt coming from?
Decaying plant matter accounts for some of it. Minerals being washed down from the mountains through rivers probably has something to do with it. Sometimes oceans rise over stuff and deposit a bunch of silt, and then later receed. Remember, dinasaurs were around a long time ago, so the amound of dirt and stuff that's settled over them isn't really that much when you conisder how much time has passed.
This is a very amateur analysis based on intuition. I'm sure a geologist could help you out.
ps. oh yeah, Volcanoes.
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